EP1836349A1 - Vorrichtung und verfahren zur herstellung und/oder veredelung einer faserstoffbahn - Google Patents

Vorrichtung und verfahren zur herstellung und/oder veredelung einer faserstoffbahn

Info

Publication number
EP1836349A1
EP1836349A1 EP05823820A EP05823820A EP1836349A1 EP 1836349 A1 EP1836349 A1 EP 1836349A1 EP 05823820 A EP05823820 A EP 05823820A EP 05823820 A EP05823820 A EP 05823820A EP 1836349 A1 EP1836349 A1 EP 1836349A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
drying
jacket
cylinder jacket
module
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05823820A
Other languages
German (de)
English (en)
French (fr)
Inventor
Rainer Kloibhofer
Christoph Haase
Thomas Gruber-Nadlinger
Herbert Boden
Erich Rollenitz
Manfred Gloser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1836349A1 publication Critical patent/EP1836349A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/021—Construction of the cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0253—Heating or cooling the rolls; Regulating the temperature
    • D21G1/0266—Heating or cooling the rolls; Regulating the temperature using a heat-transfer fluid

Definitions

  • the present invention relates to a device for producing and / or finishing a fibrous web, in particular paper or board web, with a heatable and rotatable cylinder, in particular drying cylinder of a dryer section, with an acted upon from the inside with a heating fluid cylinder jacket.
  • Such a heated cylinder is known from DE 102 60 509.2.
  • tensile stresses which arise because the inner region of the cylinder expands more than the outer region, are minimized by the fact that the cylinder jacket consists of at least two cladding layers and the material of the outer cladding layer at an assembly temperature which is below the middle operating temperature, a larger coefficient of thermal expansion and at a mounting temperature, which is above the average operating temperature, a smaller thermal expansion coefficient than the material of the inner cladding layer has.
  • Another measure is that the layer thickness of the outer cladding layer is less than that of the inner cladding layer.
  • EP 0 559 628 B1 discloses a dryer for drying a fibrous web, in which a flow-through cylinder is used in conjunction with a blowing head. This is provided with a nozzle arrangement, with the aid of which drying gas jets are applied to the outer surface of the web to be dried, while this is guided around the heated cylinder over a sector of about 270 ° or more.
  • the jacket of the cylinder is provided with a system of ductwork into which a coolant can be directed from a coolant source.
  • a coolant can be directed from a coolant source.
  • water in the web is evaporated to the outside and removed through spaces in the Anblasaube.
  • the entire interior of the cylinder is available to receive the condensate.
  • the inner wall of the cylinder must have a certain minimum wall thickness in order to be able to withstand the pressure loads at the cylinder diameters used.
  • the heating fluid can be brought very close to the outer surface of the heated cylinder.
  • the temperature gradient is thereby lower than in the known devices of the type mentioned and accordingly, the drying performance is increased. Due to the modular construction, the production is simplified.
  • a further cylinder jacket is arranged within the cylinder jacket, which is spaced apart from the outer cylinder jacket.
  • the outer cylinder shell is supported on the inner cylinder shell.
  • the wall thickness of the outer cylinder shell can be kept low because the inner cylinder shell acts as a support cylinder. The drying performance can be increased even further.
  • Open and / or closed profiles can form a module.
  • segments of the inner cylinder jacket and / or outer cylinder jacket on the one hand and one or more connecting elements on the other hand can form a module. This is advantageous in terms of production and enables easy assembly. In addition, the realization of different sizes with the same modules is easily possible.
  • the drying cylinder can be modular in both the axial and the circumferential direction, but also in both directions.
  • the individual modules are then lined up in the circumferential direction and / or axially.
  • axial modules may have a length of up to 7 m
  • peripheral modules for example, a length of 1 m.
  • the prefabricated ring modules or partial ring modules can be easily mounted and connected with each other.
  • a module can form one or more guide channels for the heating fluid. By stringing together these modules creates the desired channel system, without the individual modules must be sealed against each other. Another advantage of this design is that the compressive forces are absorbed within the modules and do not stress the connections between the modules.
  • connection of the modules can be done not only by welding but also by soldering,
  • Screws done by form or by adhesion. Also combinations of these are possible.
  • webs, rods, pins, rivets, bolts, screws and / or other connecting means may be provided for supporting the outer cylinder jacket on the inner cylinder jacket. It is important that the connecting means are distributed over the surface of both cylinder jackets to ensure a uniform support.
  • the webs or other connecting elements can extend axially, in the circumferential direction and / or in an intermediate direction. In all cases good support can be achieved.
  • the heating fluid can then flow not only in the circumferential direction but also in the longitudinal direction of the drying cylinder.
  • the inside of the outer cylinder jacket is provided with elevations.
  • the accumulating on the inside of the outer cylinder shell condensate is added to turbulence, whereby the heat transfer improves.
  • the accumulating condensate acts namely heat-insulating and increases the temperature gradient to the cylinder surface.
  • the inside of the outer cylinder jacket surface is formed with ribs and / or knobs and / or a grid or honeycomb structure.
  • the elevations preferably extend in the cylinder longitudinal direction and / or along a helix.
  • a helical line By a helical line, a special conveying effect for condensate removal can be achieved.
  • the outer surface of the drying cylinder may be provided with a coating or cover. This is used in particular for corrosion or abrasion protection or to improve the surface, for example, to avoid the sticking of paper.
  • web plates are provided as connecting elements between the inner and outer cylinder jacket, which are connected to the inner cylinder jacket.
  • the outer cylinder jacket is preferably formed by cover plates, which are also connected to the web plates.
  • the web and cover plates are combined into profiles, preferably U-shaped or T-shaped.
  • a cylinder jacket which is designed as a thick-walled tube and are introduced into the channels for the heating fluid, for example by deep hole drilling or milling. Also in this way, the heating fluid can be brought close to the outer surface of the drying cylinder and thus the drying performance can be increased.
  • the elevations on the inside of the outer cylinder shell can be milled, drawn, pressed, rolled or cast. Other types of production are possible.
  • the webs, sheets or other fasteners between the inner and outer cylinder jacket can be made by machining, ur- or forming technology. A combination of these methods is possible.
  • a device of the type mentioned is preferably used for producing a fibrous web, in particular paper or board web.
  • a drying cylinder of the type mentioned or several such drying cylinders can be used.
  • a drying cylinder according to the present invention may also be combined with conventional drying cylinders.
  • Cylinder drying, Boost-Dryer processes, Condebelt processes, Yankee cylinders and Hi- Dryer are particularly suitable as conventional drying processes.
  • the drying capacity can be increased. This allows a finished dry paper can be achieved with less residence time. This can be used on the one hand, that compared to a dryer section according to the prior art, less space is needed, resulting in savings in the base price, the construction costs for the hall, machine seating and the hood and the operating costs for drives and hood ventilation. On the other hand, this can be used by increasing the speed of the dryer section given the same space conditions, for example paper machine conversions. The paper machine can thereby be operated more economically 8th
  • the vapor pressure can be lowered.
  • the differential vapor pressure could be used, for example, to generate electricity, or the energy for steam generation can be minimized.
  • FIG. 1 shows a longitudinal section through a drying cylinder of a device according to the invention
  • Fig. 2 is a partial plan view of the front side of the drying cylinder of
  • FIG. 3 shows a partial cross section through a drying cylinder of a device according to the invention
  • FIG. 4 shows a variant of FIG. 3,
  • FIG. 5 shows a further variant of FIG. 3,
  • Fig. 6 is a side view of a drying cylinder of a device according to the invention.
  • FIG. 7 shows a cross section through the drying cylinder of FIG. 6.
  • Fig. 1 shows a drying cylinder in the dryer section of a paper machine.
  • the drying cylinder comprises an outer cylinder shell 1 and a 9
  • the inner cylinder shell 2 is fastened by screws 3 to two end caps 4, which are disc-shaped and each have a bearing axis 5, 6.
  • On the left side in Fig. 1 is drive side, on the right side of the leader of the drying cylinder.
  • the outer cylinder shell 1 has an outer surface 7, over which a paper web to be dried is guided.
  • the outer surface 7 of the outer cylinder jacket 1 is flush with the peripheral surfaces 8 of the two covers 4 executed. This creates a continuous contact surface for the paper web.
  • the outer cylinder jacket 1 has a thickness di that is smaller than the thickness d2 of the inner cylinder jacket 2.
  • the inner jacket surface 9 of the outer cylinder jacket 1 has a distance to the outer jacket surface 10 of the inner cylinder jacket 2, so that between outer Cylinder shell 1 and inner cylinder shell 2, an annular cavity 11 is formed.
  • This annulus 11 is on both ends of the two cylinder mantles 1, 2 via channels not shown here in the lids 4 with radial channels 12, 13 in the two axes 5, 6 of the cover 4 in connection.
  • the radial channels 12 of the axis 5 of the driver side cover 4 are in turn connected to an axial channel 14 in connection, which is centrally provided in the axis 5 of the driver side cover 4 and opens into a connection end 15.
  • the radial channels 13 of the axis 6 of the drive-side cover 4 are connected to an axial channel 16.
  • this channel 16 is guided concentrically to the axis of rotation I of the drying cylinder centrally through the two cylinder jackets 1, 2 and the axle 5 of the driver-side cover 4 and also opens into a connection 10
  • the channel 16 penetrates the channel 14 concentrically, so that the channel 14 has an annular cross-section.
  • Cylinder jacket 1 and the inner cylinder shell 2 allows.
  • heating fluid is supplied via the connection end 15 in the annular channel 14. From there, the heating fluid passes through the radial channels 12 in the channels, not shown, in the driver side cover 4 and of these in the cavity 11 between the outer cylinder shell 1 and inner cylinder shell 2. The heating medium then flows from the leader side through the cavity 11 on the drive side and passes there via the channels, not shown in the drive-side cover 4 in the radial channels 13 of the triebseitr gene axis 6. From there, in turn, the heating fluid flows through the central channel 16 back to the terminal end 17th
  • the outer cylinder shell 1 has on both end sides in each case tapered portions 18, with which the outer cylinder shell 11 each rests on a corresponding seat 19 on the peripheral sides of the cover 4.
  • the outer cylinder jacket 1 is supported on the two covers 4.
  • the main support of the outer cylinder shell 1 takes place over its length by means of connecting elements 20, as they are exemplified in Fig. 2 and which are arranged distributed over the peripheral surfaces of the outer cylinder shell 1 and the inner cylinder shell 2.
  • Fig. 2 also shows a siphon 21, which is provided for the removal of condensate at the front end of the cavity 11.
  • Such siphons 21 may be provided both on the drive side and on the driver's side and be formed either co-rotating or stationary. In the circumferential direction and several such siphons can be provided. 11
  • FIGS. 3 to 7 Various variants of the modular construction of the drying cylinder according to the invention are shown in FIGS. 3 to 7 and are described below.
  • Fig. 3 to 5 show a peripheral portion of a drying cylinder according to the invention with an outer cylinder shell 1 th small thickness di and an inner cylinder shell 2 on the other hand, greater thickness d2. Between the outer cylinder shell 1 and the inner cylinder shell 2, a cavity 11 for passing a heating fluid is present.
  • modules 22 are provided which are applied to the inner cylinder jacket 2 as a support tube.
  • the modules 22 are arranged adjacent to each other in the circumferential direction and together form the outer cylinder shell 1 and the cavity 11 between the outer cylinder shell 1 and inner cylinder shell 2.
  • the outer cylinder shell 1 is supported on the inner cylinder shell 2 from.
  • the modules 22 are designed as tubes 23 that are substantially rectangular in the outer circumference and extend in the longitudinal direction of the drying cylinder.
  • the cavities 24 of the rectangular tubes 23 form channels for the heating fluid and together together the cavity 11 between the outer cylinder shell 1 and inner cylinder shell 2.
  • surveys 27 are arranged, which put a running there settling Bankfluidkondensat in turbulence. 12
  • the tubes 23 are connected to the inner cylinder shell 2 by screws 28.
  • the inner cylinder shell 2 holes 29 at the appropriate place.
  • Associated threaded holes 30 are provided in the two lateral portions 31 of the tubes 23.
  • the juxtaposed tubes 23 may also be welded together. To achieve a smooth surface then the outer side 7 of the outer cylinder shell 1 can be turned off.
  • the variant shown at D2 in FIG. 3 largely corresponds to the variant of D1.
  • Modules 22 A welded connection can be omitted here if necessary.
  • a form-locking connection is also provided between the adjacent tubes 23.
  • the tubes 23 have on their left side an upwardly curved, rounded projection 34 and on their right side a correspondingly shaped recess 35 into which the projection 34 engages.
  • a welded connection between the tubes 23 can be dispensed with.
  • the variant shown at D4 in FIG. 4 is virtually identical to the variant at D3 in FIG. The only difference is that the projections at D4 are smaller in cross-section than in the variant of D3 in FIG. 3 and correspondingly also the recesses 35. 13
  • FIG. 4 shows a variant which completely coincides with the variant at D4 from the outer circumference.
  • the tubes 23 do not have one but two chambers 24, which are arranged side by side in the circumferential direction of the drying cylinder.
  • the threaded holes 30 are not provided here for screwing in the fastening screws 28 in the lateral sections 31 of the tubes 23 but in the partition 36 between the two chambers 24. In this variant, therefore, unlike the variants described above, only a series of screws 28th provided in the longitudinal direction of the drying cylinder per tube 23.
  • a variant which largely corresponds to the variant at D5 is shown at D6 in FIG. The only difference is that here the tubes 23 have a greater width in the circumferential direction of the drying cylinder.
  • an inner cylinder jacket 2 is also provided, which serves as a support tube.
  • On this inner cylinder shell 2 are U-shaped, in the longitudinal direction of the drying cylinder concernedre- ckende profiles 37 are welded in cross-section.
  • the opening of the U-shape in this case points to the inner cylinder shell 2, so that channels 38 are formed for the heating fluid between the U-profiles and the inner cylinder jacket.
  • the U-profiles 37 are arranged in the circumferential direction of the drying cylinder spaced from each other on the inner cylinder shell 2. Adjacent U-profiles 37 are connected to each other via flat sections 39 which are welded at the level of the base 40 of the U-profiles 37 with these. As a result, between the legs 41 of two adjacent U-profiles 37, the flat profile 39 arranged there and the inner cylinder jacket 2 respectively 14
  • the bases 40 of the U-profiles 37 and the flat sections 39 together form the outer cylinder jacket 1 and are formed with a flush outer side 7.
  • the channels 38 and the channels 42 together form the cavity 11 between the outer cylinder shell 1 and the inner cylinder shell 2.
  • Fig. 6 shows a drying cylinder, in which annular modules 43 are arranged one behind the other in the longitudinal direction of the drying cylinder. Not only two but also more modules 43 can be arranged one behind the other.
  • the end of the drying cylinder is closed by cover 4, each having an axis 5, 6.
  • the modules 43 are connected to each other and to the covers by welding.
  • FIG. 7 the cross section of the modules 43 of Fig. 6 can be seen. These are each a massive ring or pipe section 44, in the in

Landscapes

  • Drying Of Solid Materials (AREA)
  • Paper (AREA)
EP05823820A 2005-01-05 2005-11-23 Vorrichtung und verfahren zur herstellung und/oder veredelung einer faserstoffbahn Withdrawn EP1836349A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005000794A DE102005000794A1 (de) 2005-01-05 2005-01-05 Vorrichtung und Verfahren zur Herstellung und/oder Veredelung einer Faserstoffbahn
PCT/EP2005/056166 WO2006072508A1 (de) 2005-01-05 2005-11-23 Vorrichtung und verfahren zur herstellung und/oder veredelung einer faserstoffbahn

Publications (1)

Publication Number Publication Date
EP1836349A1 true EP1836349A1 (de) 2007-09-26

Family

ID=36072193

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05823820A Withdrawn EP1836349A1 (de) 2005-01-05 2005-11-23 Vorrichtung und verfahren zur herstellung und/oder veredelung einer faserstoffbahn

Country Status (8)

Country Link
US (1) US20070289156A1 (ru)
EP (1) EP1836349A1 (ru)
JP (1) JP2008527180A (ru)
CN (1) CN101098997A (ru)
BR (1) BRPI0518089B1 (ru)
DE (1) DE102005000794A1 (ru)
RU (1) RU2364672C2 (ru)
WO (1) WO2006072508A1 (ru)

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RU2007129849A (ru) 2009-02-20
CN101098997A (zh) 2008-01-02
JP2008527180A (ja) 2008-07-24
WO2006072508A1 (de) 2006-07-13
DE102005000794A1 (de) 2006-07-13
BRPI0518089B1 (pt) 2016-12-20
US20070289156A1 (en) 2007-12-20
BRPI0518089A (pt) 2008-10-28
RU2364672C2 (ru) 2009-08-20

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